tofsee | 035d4c6bea59c1b9384e736bfba08de6d1b7e8859a6201f727b760624af29c8b

General

Target

7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe
Size

146KB
MD5

edeb8cf6ad50b2189148305da1711683
SHA1

a5843da9541016d02e3daf537a3781c9dac0716c
SHA256

7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396
SHA512

8cf6653627e3dcf78d45d12edd93ed27fc052534d4731c6695e4cc6ce7d271aa7f02a94ea5b70c8783c62c4bf4d334681b19213aede987f597558be0dd8be8fa
SSDEEP

3072:AVt0N0vO/6B9v5qJO1POmehbsM6FGUuBi:G9O/6BKJOBe7c78

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

jotunheim.name

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

fvomjszy.exe

pid process

3292 fvomjszy.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

3348 netsh.exe

pid	process
3292	fvomjszy.exe

pid	process
3348	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\vrxvoxrn\ImagePath = "C:\\Windows\\SysWOW64\\vrxvoxrn\\fvomjszy.exe"	svchost.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe

Drops file in System32 directory 1 IoCs

Processes:

svchost.exe

description ioc process

File created C:\Windows\SysWOW64\config\systemprofile:.repos svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

fvomjszy.exe

description pid process target process

PID 3292 set thread context of 2284 3292 fvomjszy.exe svchost.exe
Launches sc.exe 3 IoCs
Sc.exe is a Windows utlilty to control services on the system.

Processes:

sc.exesc.exesc.exe

pid process

2144 sc.exe
3092 sc.exe
2388 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

description	ioc	process
File created	C:\Windows\SysWOW64\config\systemprofile:.repos	svchost.exe

description	pid	process	target process
PID 3292 set thread context of 2284	3292	fvomjszy.exe	svchost.exe

pid	process
2144	sc.exe
3092	sc.exe
2388	sc.exe

Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid	pid_target	process	target process
4604	2800	WerFault.exe	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe
4460	3292	WerFault.exe	fvomjszy.exe

Modifies data under HKEY_USERS 3 IoCs

Processes:

svchost.exe

description	ioc	process
Set value (data)	\REGISTRY\USER\.DEFAULT\Control Panel\Buses\Config0 = b4e0b43d2b11940124edb47d450dd49d084297dce82e72baa49343fd8420851d2ab8680b87cd945d24edb47d470dd49d024195daf71261adc06d04fda6e22673bbc9154961cda56810de814b743cecaf644490bdb57420ef955506c8fc8d3c74bbc4103d29fca56d1dda854f7435e09d084295d9e13f4bb4c06d00fdadfd5430d29f470d31fea56f13edc70f3252a0f40948f490b57e2ceb905c0cc4c4e13b7e85c12b496da0f15d15d8804e713be4af5714f459a43414f2786d68fdc48d541ce4ad744a6bbfff02579fc27d440dd49d642df40409d27e98a46d34fdc741461ee4ad743c35faa27315dc8753753ce1b35518ccbd844d14dda46d34fdc48d541de4ad743d04cd945d24edb47d440dd49d642df4bd844d14dda46d34fdc48d541de4ad743de6cc945d	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\MY	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Control Panel\Buses	svchost.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exefvomjszy.exe

description	pid	process	target process
PID 2800 wrote to memory of 3516	2800	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe	cmd.exe
PID 2800 wrote to memory of 3516	2800	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe	cmd.exe
PID 2800 wrote to memory of 3516	2800	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe	cmd.exe
PID 2800 wrote to memory of 1176	2800	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe	cmd.exe
PID 2800 wrote to memory of 1176	2800	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe	cmd.exe
PID 2800 wrote to memory of 1176	2800	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe	cmd.exe
PID 2800 wrote to memory of 2144	2800	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe	sc.exe
PID 2800 wrote to memory of 2144	2800	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe	sc.exe
PID 2800 wrote to memory of 2144	2800	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe	sc.exe
PID 2800 wrote to memory of 3092	2800	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe	sc.exe
PID 2800 wrote to memory of 3092	2800	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe	sc.exe
PID 2800 wrote to memory of 3092	2800	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe	sc.exe
PID 2800 wrote to memory of 2388	2800	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe	sc.exe
PID 2800 wrote to memory of 2388	2800	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe	sc.exe
PID 2800 wrote to memory of 2388	2800	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe	sc.exe
PID 2800 wrote to memory of 3348	2800	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe	netsh.exe
PID 2800 wrote to memory of 3348	2800	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe	netsh.exe
PID 2800 wrote to memory of 3348	2800	7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe	netsh.exe
PID 3292 wrote to memory of 2284	3292	fvomjszy.exe	svchost.exe
PID 3292 wrote to memory of 2284	3292	fvomjszy.exe	svchost.exe
PID 3292 wrote to memory of 2284	3292	fvomjszy.exe	svchost.exe
PID 3292 wrote to memory of 2284	3292	fvomjszy.exe	svchost.exe
PID 3292 wrote to memory of 2284	3292	fvomjszy.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe
"C:\Users\Admin\AppData\Local\Temp\7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2800

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vrxvoxrn\
2⤵
PID:3516

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fvomjszy.exe" C:\Windows\SysWOW64\vrxvoxrn\
2⤵
PID:1176

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create vrxvoxrn binPath= "C:\Windows\SysWOW64\vrxvoxrn\fvomjszy.exe /d\"C:\Users\Admin\AppData\Local\Temp\7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:2144

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description vrxvoxrn "wifi internet conection"
2⤵
- Launches sc.exe
PID:3092

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start vrxvoxrn
2⤵
- Launches sc.exe
PID:2388

C:\Windows\SysWOW64\netsh.exe
"C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
2⤵
- Modifies Windows Firewall
PID:3348

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2800 -s 1168
2⤵
- Program crash
PID:4604

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2800 -ip 2800
1⤵
PID:1940

C:\Windows\SysWOW64\vrxvoxrn\fvomjszy.exe
C:\Windows\SysWOW64\vrxvoxrn\fvomjszy.exe /d"C:\Users\Admin\AppData\Local\Temp\7d3519a3112bac6d47e4a28afa93765ad0fe109d3e203f1f07dfcf8fb84b2396.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3292

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:2284

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3292 -s 520
2⤵
- Program crash
PID:4460

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 188 -p 3292 -ip 3292
1⤵
PID:1892

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

New Service

1

T1050

Modify Existing Service

1

T1031

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

New Service

1

T1050

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\fvomjszy.exe
Filesize
11.0MB

MD5
cee4227ba4644c8aa3a553427ab905a6

SHA1
5013623e5e96c4d71be0bc9f79b8da4955730534

SHA256
98635dfe6f49d84d67be7f7ec58b24d2963c94f8d67884eb785031bf3ec1d027

SHA512
2d31a5f36977a2c9ae7dd76b2135e801f0e895003c356bb708be1a5d43aa9539858ef211a091a29e601796cc35578adc64d3209c5cfee8bd0e66c0d08795ea49

Download Submit
C:\Windows\SysWOW64\vrxvoxrn\fvomjszy.exe
Filesize
11.0MB

MD5
cee4227ba4644c8aa3a553427ab905a6

SHA1
5013623e5e96c4d71be0bc9f79b8da4955730534

SHA256
98635dfe6f49d84d67be7f7ec58b24d2963c94f8d67884eb785031bf3ec1d027

SHA512
2d31a5f36977a2c9ae7dd76b2135e801f0e895003c356bb708be1a5d43aa9539858ef211a091a29e601796cc35578adc64d3209c5cfee8bd0e66c0d08795ea49

Download Submit
memory/1176-138-0x0000000000000000-mapping.dmp

Download
memory/2144-140-0x0000000000000000-mapping.dmp

Download
memory/2284-162-0x00000000010F0000-0x0000000001100000-memory.dmp

Filesize
64KB

Download
memory/2284-149-0x0000000000780000-0x0000000000795000-memory.dmp

Filesize
84KB

Download
memory/2284-159-0x00000000010E0000-0x00000000010E6000-memory.dmp

Filesize
24KB

Download
memory/2284-148-0x0000000000000000-mapping.dmp

Download
memory/2284-156-0x0000000000ED0000-0x00000000010DF000-memory.dmp

Filesize
2.1MB

Download
memory/2284-155-0x0000000000780000-0x0000000000795000-memory.dmp

Filesize
84KB

Download
memory/2284-154-0x0000000000780000-0x0000000000795000-memory.dmp

Filesize
84KB

Download
memory/2388-142-0x0000000000000000-mapping.dmp

Download
memory/2800-136-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/2800-135-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/2800-132-0x0000000000DDE000-0x0000000000DEE000-memory.dmp

Filesize
64KB

Download
memory/2800-133-0x0000000000C60000-0x0000000000C73000-memory.dmp

Filesize
76KB

Download
memory/2800-134-0x0000000000DDE000-0x0000000000DEE000-memory.dmp

Filesize
64KB

Download
memory/2800-146-0x0000000000C60000-0x0000000000C73000-memory.dmp

Filesize
76KB

Download
memory/2800-145-0x0000000000DDE000-0x0000000000DEE000-memory.dmp

Filesize
64KB

Download
memory/2800-147-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/3092-141-0x0000000000000000-mapping.dmp

Download
memory/3292-153-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/3292-152-0x0000000000D38000-0x0000000000D49000-memory.dmp

Filesize
68KB

Download
memory/3348-143-0x0000000000000000-mapping.dmp

Download
memory/3516-137-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads